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JAMB Chemistry 1981 Question 37

Question 37

Metals and their Compounds

In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?

  1. A.CO2 + C → 2CO
  2. B.2Fe2O3 + 3C → 4Fe + 3CO2
  3. C.Fe2O3 + 3CO → 2Fe + 3CO2
  4. D.CaCO3 → CaO + CO2
  5. E.CaO + SiO2 → CaSiO3.
Show the answer and explanation

Answer: B (2Fe2O3 + 3C → 4Fe + 3CO2)

Explanation

In the blast furnace the ore is reduced by carbon monoxide, not directly by carbon to CO2. The other reactions make the CO and remove the sand impurity as slag.